Noise shifting from 1st to 2nd only
 

As title says, I hear a squeak only shifting from 1st to 2nd, not from 3rd to 2nd, and not when in neutral parked shifting around but only when under load. It's obviously not the clutch and I can hold the clutch in for a few seconds coasting before shifting it to 2nd and it will still make the noise. There's no grinding, no clunking, shifting is still smooth but it makes that annoying squeak.

Upon reading I've heard a few say they've heard this noise a lot more with the AF SS which I have installed but I never noticed the sound for the past week I've gotten the car on the road since installing it until now. Other people believe this is normal and when they change their tranny oil it goes away (which I plan on doing myself shortly).

Looking for more thoughts on this or if anyone had it evolve to a much bigger problem even after changing tranny oil?